Glass memory?

[Mark Huffstutter]

That's where I first learned about SAW devices, in Broadcasting.
Used to maintain Ikegami 79D ENG field cameras, Ike used them
As H line delays to construct a mask signal of sorts to generate
A Horizontal edge signal, which was applied to the video signal
To add a "Detail" enhancement for sharpening the pix. Right up
To a ringing edge, if You liked that sort of thing.......

Mark

-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brent Hilpert via cctalk
Sent: Thursday, March 31, 2022 11:47 PM
To: Anders Nelson; General Discussion: On-Topic Posts
Subject: Re: Glass memory?

On 2022-Mar-31, at 8:05 PM, Anders Nelson via cctech wrote:
> Hey all, found this on eBay:
> 
> https://www.ebay.com/itm/Corning-Glass-memory-/125087612899
> 
> I can't find any info on it - was it some kind of delay-line or magnetic
> laminate stack?
> 
> Interesting!


Very interesting - there were glass/quartz delay lines used in TV but never seen such before for digital.

So first guess was it's a SAW device (Surface Acoustic Wave) delay line, but wondered how the path would be long enough for delays needed (path too short for waves too fast).

Second guess then could be a quartz internal reflection delay line. See pdfPg.9:

	https://www.pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_16/Sec_53/Philips_Tech_Review/PTechReview-25-1963_64-234.pdf

I've analysed a couple of magneto-strictive wire acoustic delay lines so have some feel for properties/numbers there, but don't know how glass/quartz compares.